Extending HDMI

Rensin

Rensin

Rensin

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Joined
15 Feb 2008
Posts
1,323
Hi,
Currently I have a 25ft Hdmi cable going from a Hdmi splitter to my pc (elgato hd60 pro) but for a while now the audio has being going out of sync.

If you watch while my pc is recording the audio looks to be all OK and in sync. Soon as you stop the recording and playback on my pc you can see the audio is oos and gets worse throughout the recording. (also tried on my HTPC with the same problem)

I guess the problem is because of the length of Hdmi cable? .... if so is there anyway of boosting the signal?

Hdmi splitter (240v powered)
Amazon Basic Hdmi cable (25 feet)
 
Psycho Sonny said:
easier just to move the pc closer? or move whatever your source is closer to pc.

or buy a better quality HDMI cable. and by higher quality i don't mean a £100 one i mean one by a reputable brand like IBRA or that german supplier with the blue tips.
Click to expand...

ok so a decent cable should sort my sync problems?

From the rainforest site?

IBRA® PRO GOLD RED Range is a HDMI 2.0/1.4a Vesion Super High Quality and a High Speed HDMI cable with 2160P,3D,Ethernet (Connector Type A to A)
 
jpaul said:
if you connect a display (as opposed to elgato) directly on the 25ft hdmi does that fail too ? if not then it is the elgato that may have the problem ....
more likely to be a hardware elgato or splitter issue than cable if it had been working.
Click to expand...

no mate, picture is ok. Even when recording the preview window looks in sync too.

Have tried 3 different splitters with same results.

Also tried a HD PVR 2 with same results so not the Elgato.

Elgato support were not much use. Tried everything they mentioned in the end they passed it onto 2nd Line support and not had a reply.
 
NexusK said:
If it's getting to the PC in sync and it's only after being recorded that it's out of sync then I doubt the problem is the HDMI cable.

Is the capture card recording in exactly the same FPS as the source? Or maybe it's recording at variable framerate instead of fixed.
Click to expand...

Just recording 1 now to check.

I think it is a constant framerate @50fps.
 
NexusK said:
If it's getting to the PC in sync and it's only after being recorded that it's out of sync then I doubt the problem is the HDMI cable.

Is the capture card recording in exactly the same FPS as the source? Or maybe it's recording at variable framerate instead of fixed.
Click to expand...

ok Audio is recording at a Variable bitrate.

Here is the spec: (I recorded 1080 @25FPS) and audio is oos.


Video
ID : 100 (0x64)
Menu ID : 2 (0x2)
Format : AVC
Format/Info : Advanced Video Codec
Format profile : [email protected]
Format settings, CABAC : Yes
Format settings, ReFrames : 1 frame
Format settings, GOP : M=1, N=6
Codec ID : 27
Duration : 1 h 8 min
Bit rate mode : Variable
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate : 25.000 FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Color range : Full
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio
ID : 101 (0x65)
Menu ID : 2 (0x2)
Format : AAC
Format/Info : Advanced Audio Codec
Format version : Version 4
Format profile : LC
Muxing mode : ADTS
Codec ID : 15
Duration : 1 h 8 min
Bit rate mode : Variable
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 48.0 kHz
Frame rate : 46.875 FPS (1024 spf)
Compression mode : Lossy
 
Psycho Sonny said:
the longer cable of HDMI you buy it's better to buy better quality. People say HDMI either works or it doesn't well I can tell you that is BS I had a cheap failing cable and was giving me a green picture. it may not be the cable but he can eliminate if it is or not by spending £5 on a better cable
Click to expand...

ok have just bought the IBRA cable mentioned above.

My HDMI splitter says it supports cables upto 10m. (240v plug)

Max Cable Extension: 10 meters by 28AWG HDMI cable
 
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